Perfume mixtures comprising an olfactive index for activated air fresheners

ABSTRACT

A perfume mixture comprising an olfactive index and vapor pressure distribution for improved diffusion from activated air fresheners and methods thereof are provided.

FIELD

The present invention relates to perfume mixtures comprising anolfactive index and vapor pressure distribution for improved diffusionfrom activated air fresheners and methods thereof.

BACKGROUND

Various devices in the marketplace provide emission of a volatileperfume mixture over a period of time using a diffusion assistancemeans, such as heating elements, piezoelectric elements, and motorizedfans. While energized assistance of such devices facilitates diffusingthe perfume mixture, often times, this leads to quicker perfume mixtureend-of-life and/or a less consumer desirable scent experience with highinitial scent intensity. Approaches to lengthen the duration of emissionof the perfume mixture include formulating less volatile (i.e. lowervapor pressure) perfume materials in the perfume mixture and using alarger volume of the perfume mixture in the device. However, theseapproaches may not achieve a consumer acceptable scent experience andmay involve higher costs for the increased amount of perfume mixtureand/or the increased amount of perfume raw materials that are formulatedinto the perfume mixture.

There remains a need for perfume mixtures providing consumer desirablescent experiences and longevity, while minimizing the amount of perfumemixture and perfume raw materials necessary to achieve such experienceand longevity.

SUMMARY

According to one embodiment, there is provided a perfume mixturecomprising an olfactive index of at least about 12,000, wherein saidperfume mixture comprises at least about 5 wt. % of perfume rawmaterials having an odor detection threshold less than or equal to about1 ppb, and comprises about 45 wt. % to about 85 wt. % of perfume rawmaterials having a weighted average vapor pressure range from about15,000 ppb to about 20,000 ppb.

According to another embodiment, there is provided a method offormulating a perfume mixture for use with an energized air freshenercomprising the steps of calculating the average olfactive index of saidperfume mixture, and selecting perfume raw materials that provide aperfume mixture with an average olfactive index of at least about12,000.

According to yet another embodiment, there is provided a perfume mixturecomprising an olfactive index of at least about 12,000, wherein saidperfume mixture comprises at least about 5 wt. % of perfume rawmaterials having an odor detection threshold less than or equal to about1 ppb, and a sensory intensity rating of greater than or equal to 45.

BRIEF DESCRIPTION OF DRAWINGS

The above-mentioned and other features and advantages of the presentdisclosure, and the manner of attaining them, will become more apparentand the present disclosure itself will be better understood by referenceto the following description of various embodiments of the presentdisclosure taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is graph showing the scent intensity of various perfumesmixtures.

DETAILED DESCRIPTION

“Energized” as used herein refers to an apparatus or system thatoperates by using an electrical energy source, such as a battery orelectrical wall outlet, to diffuse or emit a targeted active such as aperfume mixture.

It should also be understood that when the perfume mixture is describedherein as being “delivered” or “emitted” or “diffused”, this refers tothe volatilization of the volatile component therein, and does notrequire that the non-volatile components therein be emitted.

The features illustrated or described in connection with one exampleembodiment can be combined with the features of other exampleembodiments. Such modifications and variations are intended to beincluded within the scope of the present disclosure.

For example, the perfume mixture may be contained in a reservoir havinga fluid transport member for use with an energized device. An exemplaryenergized device may be an electrical heating device. More particularly,the device may be an electrical wall plug air freshener having a wick asdescribed in U.S. Pat. No. 7,223,361; a battery powered heating device;or other heating devices (e.g. devices powered by chemical reactionssuch as catalyst fuel systems; solar powered devices, etc.). In suchdevices, the wick may be placed next to the heating surface to diffusethe volatile material. The perfume mixture may also be contained in areservoir for use with an air purifying system or a fan-based airfreshener to deliver volatile materials to the atmosphere.

The perfume mixture of the present invention delivers a volatilematerial in a substantially continuous manner when the device isactivated. The emission level of volatile materials may exhibit auniform intensity until substantially all the volatile materials areexhausted. The continuous emission of the volatile materials can be ofany suitable length, including up to: 20 days, 30 days, 60 days, orlonger periods.

Perfume Mixture

The perfume mixture of the present invention may comprise at least oneperfume raw material (“PRM”). Most conventional PRMs are volatileessential oils. The PRM can be a volatile organic compound commonlyavailable from perfumery suppliers. Furthermore, the PRM can besynthetically or naturally formed materials. Examples include oil ofbergamot, bitter orange, lemon, mandarin, caraway, cedar leaf, cloveleaf, cedar wood, geranium, lavender, orange, origanum, petitgrain,white cedar, patchouli, neroili, rose absolute, and the like.

While not wishing to be bound by theory, the continuous delivery of aPRM may be a function of various factors. These factors include thephysical properties of a PRM such as molecular weight and saturationvapor pressure (“VP”), odor detection threshold (“ODT”), etc.; the typeof fluid transport member (e.g. pore size, surface area, etc.) used todiffuse the PRM; environmental factors such as heat, air flow, etc.; theexistence of the viscosity and/or surface tension of the perfume mixturecontaining the PRM; etc.

It has surprisingly been found that the combination of certain VPs andODTs have an olfactive index (“OI”) that not only provides consumerdesirable scent intensity and longevity, but also consumer desirablescent character. The perfume mixture of the present invention may havean OI of greater than about 12,000, or greater than about 20,000, orgreater than about 25,000, or greater than about 28,000, or from about12,000 to about 500,000, or from about 20,000 to about 100,000, or fromabout 25,000 to about 100,000, or from about 25,000 to about 80,000, orfrom about 25,000 to about 60,000, or from about 40,000 to about 60,000.

OI is calculated by the following equation:

${OI} = {\sum\limits_{i}\frac{x_{i} \cdot P_{{vap},i}^{{sat},{25C}}}{{ODT}_{i}}}$

where OI is defined as an olfactive index of a given perfumecomposition; P_(vap,i) ^(sat,25C) is the VP of a volatile PRM_(i) at 25°C. expressed in units of ppb; x_(i) is the molar percent of PRM_(i) inthe perfume composition; and ODT_(i) is the odor detection threshold ofPRM_(i) expressed in units of ppb; and where all PRMs in the perfumecomposition are included in the calculated OI value.

VP of individual PRMs can be calculated using the Advanced ChemistryDevelopment Labs (“ACD”) (Toronto, Canada) VP computational model,version 14.02 providing VP values at 25° C. expressed in units of torr,and then converted to partial pressure expressed as ppb, based directlyon the molecular structure.

ODT of individual PRMs can be calculated using the test method outlinedherein, based directly on the molecular structure of the given PRM, andexpressed in units of ppb. The OI calculation can be used in selectingPRMs for perfume mixtures for use, for example, in energized airfresheners.

Generation of Molecular Descriptors

For each PRM in a perfume mixture or composition, its molecularstructure is used to compute various molecular descriptors. Themolecular structure is determined by the graphic molecular structurerepresentations provided by the Chemical Abstract Service (“CAS”), adivision of the American Chemical Society, Columbus, Ohio, U.S.A. Thesemolecular structures may be obtained from the CAS Chemical RegistrySystem database by looking up the index name or CAS number of each PRM.For PRMs, which at the time of their testing are not yet listed in theCAS Chemical Registry System database, other databases or informationsources may be used to determine their structures. For a PRM which haspotentially more than one isomer present, the molecular descriptorcomputations are conducted using the molecular structure of only one ofthe isomers, which is selected to represent that PRM. The selection ofisomer is determined by the relative amount of extension in themolecular structures of the isomers. Of all the isomers of a given PRM,it is the isomer whose molecular structure has the most extendedconfiguration which is the one that is selected to represent that PRM.The structures for other potential isomers of that PRM are excluded fromthe computations. The molecular structure of the isomer with themost-extended configuration is paired with the molar % concentration ofthat PRM, where the molar % reflects the presence of all the isomers ofthat PRM that are present.

A molecule editor or molecular sketching software program, such asChemDraw (CambridgeSoft/PerkinElmer Inc., Waltham, Mass., U.S.A.), isused to duplicate the 2-dimensional molecular structure representingeach PRM. Molecular structures should be represented as neutral species(quaternary nitrogen atoms are allowed) with no disconnected fragments(e.g., single structures with no counter ions). The winMolconn programdescribed below can convert any deprotonated functional groups to theneutral form by adding the appropriate number of hydrogen atoms and willdiscard the counter ion.

For each PRM, the molecular sketching software is used to generate afile which describes the molecular structure of the PRM. The file(s)describing the molecular structures of the PRMs is subsequentlysubmitted to the computer software program winMolconn, version 1.0.1.3(Hall Associates Consulting, Quincy, Mass., U.S.A., www.molconn.com), inorder to derive various molecular descriptors for each PRM. As such, itis the winMolconn software program which dictates the structurenotations and file formats that are acceptable options. These optionsinclude either a MACCS SDF formatted file (i.e., a Structure-Data File);or a Simplified Molecular Input Line Entry Specification (i.e., a SMILESstring structure line notation) which is commonly used within a simpletext file, often with a “.smi” or “.txt” file name extension. The SDFfile represents each molecular structure in the format of a multi-linerecord, while the syntax for a SMILES structure is a single line of textwith no white space. A structure name or identifier can be added to theSMILES string by including it on the same line following the SMILESstring and separated by a space, e.g.:

-   -   C1=CC═CC=C1 benzene.

The winMolconn software program is used to generate numerous moleculardescriptors for each PRM, which are then output in a table format.Specific molecular descriptors derived by winMolconn are subsequentlyused as inputs (i.e., as variable terms in mathematical equations) forthe ODT model test method in order to calculate the ODT value for eachPRM. The molecular descriptor labels used in the ODT model test methodcomputations are the same labels reported by the winMolconn program, andtheir descriptions and definitions can be found listed in the winMolconndocumentation. The following is a generic description of how to executethe winMolconn software program and generate the required molecularstructure descriptors for each PRM in a composition.

-   -   Computing Molecular Structure Descriptors using winMolconn:    -   1) Assemble the molecular structure for one or more perfume        ingredients in the form of a MACCS Structure-Data File, also        called an SDF file, or as a SMILES file.    -   2) Using version 1.0.1.3 of the winMolconn program, running on        an appropriate computer, compute the full complement of        molecular descriptors that are available from the program, using        the SDF or SMILES file described above as input.        -   a. The output of winMolconn is in the form of an ASCII text            file, typically space delimited, containing the structure            identifiers in the first column and respective molecular            descriptors in the remaining columns for each structure in            the input file.    -   3) Parse the text file into columns using a spreadsheet software        program or some other appropriate technique. The molecular        descriptor labels are found on the first row of the resulting        table.    -   4) Find and extract the descriptor columns, identified by the        molecular descriptor label, corresponding to the inputs required        for each model.        -   a. Note that the winMolconn molecular descriptor labels are            case-sensitive.

Test Method for Determining ODT

The ODT value is computed for each free PRM identified in the perfumemixture through the use of the computational ODT model provided hereinwritten in the Java programming computer language. The program sourcecode for the ODT model is provided herein as two parts, forODTNeuralNetworks.java and ODTNeuralNetworksDescriptors.java, in wordprocessor text format. Both Java classes are needed to execute themodel. The ODTNeuralNetworksDescriptors class is a data container whosepurpose is to ensure that molecular descriptors required to execute theneural network are provided to the network in the proper order. TheODTNeuralNetworks class contains the neural network equations, andexpects an instance of the ODTNeuralNetworksDescriptors class as input.These two Java source code class files must be combined with other codewritten by the user, which will add the winMolconn descriptor datarequired to the ODTNeuralNetworksDescriptors instance, and then passthat object to an instance of ODTNeuralNetworks, and then retrieve theresult. These classes expect to be run under the Java software platformversion 1.7 or higher (Sun Microsystems/Oracle Corporation, RedwoodShores, Calif., U.S.A.).

Attached herewith is a compact disc having the above-referenced programsource code saved as “ODTNeuralNetworks” and“ODTNeuralNetworksDescriptors” (“CD-R”). The word processor text formatfiles were created on Apr. 21, 2015 and contain 141 bytes and 17 bytesof data, respectively. The CD-R is hereby incorporated by reference inits entirety.

The model used to compute ODT values is based on the ODT data providedin the book “Standardized Human Olfactory Thresholds” (Devos, M.; Patte,F.; Rouault, J.; Laffort, P.; Van Gernert, L. J.; Standardized HumanOlfactory Thresholds; IRL: Oxford, England, 1990.). In this context,human ODTs are expressed as olfactory power (p.ol) (the negative of thebase 10 log of the molar concentration of the odorant in air at which ahuman first detects the presence of the odorant). These values can bedirectly transposed to other commonly used units such as ppm (volume)and ppb (volume): thresholds of 1 ppm and 1 ppb are equivalent to p.ol=6and p.ol=9, respectively. The ODT computational model itself is a set often individual computational neural-net (“CNN”) models written in theJava programming language. The outputs of all ten CNN models areaveraged, and the average p.ol value is reported along with the standarddeviation of the set of predicted values.

The starting information required to conduct the ODT computed-value testmethod which follows, includes the identity and molecular structure ofeach PRM in the perfume mixture being tested, and the values of variouscomputationally-derived molecular descriptors for each of those PRMs, asdetermined in accordance with the respective test methods describedherein. Additionally, the weight percent of each PRM is also required inorder calculate the OI of a perfume mixture.

The specific winMolconn-derived molecular descriptors required for theODT computation include:

-   -   nasS=Count of sulfur atoms;    -   Hmax=Highest Atom Level HE-State (Site of the most polar        hydrogen atom);    -   fw=Formula weight of the structure;    -   xc3=3^(rd)-order cluster molecular connectivity index;    -   numHBa=Count of hydrogen-bond accepting atoms;    -   e2C3O1s=Sum of bond-type electrotopological state indexes for        double bonds between an oxygen atom and a carbon atom attached        to two other non-hydrogen atoms;    -   e1C3O1d=Sum of bond-type electrotopological state indexes for        single bonds between an hydroxyl oxygen atom and an sp² carbon        atom attached to two other non-hydrogen atoms;    -   SssCH2=Sum of the electrotopological state index values for        methylene (—CH₂—) carbon atoms;    -   xv1=Valence-corrected 1^(st)-order molecular connectivity index;    -   SHHBa=Sum of electrotopological state index values for all        hydrogen bond accepting atoms in the molecule;    -   nasO=Count of oxygen atoms;    -   e2C2O1=Sum of the electrotopological state indexes for double        bonds between an oxygen atom and a carbon atom attached to one        hydrogen atom and one non-hydrogen atom;    -   nasC=Count of carbon atoms;    -   SHHBd=Sum of the hydrogen atom electrotopological state indexes        for all hydrogen atoms on hydrogen-bond donating atoms;    -   nrbond=Count of rotatable bonds;    -   nelem=Count of element types;    -   SsCH3=Sum of the electrotopological state indexes for the        methyl-group (—CH₃) carbon atoms;    -   eaC2C2a=Sum of bond-type electrotopological state indexes for        aromatic bonds between two unsubstituted aromatic carbon atoms;    -   e1C3O1a=Sum of bond-type electrotopological state indexes for        single bonds between a hydroxyl oxygen atom and an aromatic ring        carbon atom;    -   SHCsatu=Sum of the hydrogen atom electrotopological state        indexes for hydrogen atoms on sp^(a) carbons that are also        bonded to sp² carbon atoms;    -   Qv=Electrotopological state polarity index;    -   nvx=Count of graph vertices (a count of non-hydrogen atoms).

The specific molecular descriptors are output by the winMolconn softwarein a table format. The ODT model itself is provided in theODTNeuralNetworks class. The ODTNeuralNetworksDescriptors helper classprovides the setter methods that allow the individual descriptors to beadded to the instance of the helper in any order. ThegetOrderedDescriptors( ) method of the helper class returns the ordereddescriptor array required for the neural network model. To execute theODT model, it is necessary to create a main class that will: 1) createan instance of the of the helper class, 2) populate the instance of thehelper class with the required descriptor values from winMolconn, 3)pass ordered descriptor array from the helper class to an instance ofthe ODT model, 4) and then get the computed ODT value back from themodel instance using the getODTModelResult( ) method. The main class isexpected to be provided by the user, and is responsible for reading inthe winMolconn descriptors, and for reporting the computed ODT valuederived from the model for each PRM.

The ODT model is in the form of a CNN. Each CNN is implemented in Java(version 1.7) with each network being embodied in a single Java classobject. In order to execute the ODT model, it is necessary to wrap themodel class with a Java main class that will create the necessary inputsfor the model class, instantiate and execute the class, and thenretrieve and report the result. The CNN model class has an associatedDescriptor class that is needed to provide the model inputs to the CNNin the proper order. The Java main class should instantiate therespective descriptor class, add the required winMolconn descriptors tothe descriptor class instance, and then pass that instance of thedescriptor class to the CNN instance as an argument.

Computing the Odor Detection Threshold:

-   -   1) Create a Java main executable class that will create and        access instances of the ODTNeuralNetworksDescriptors and        ODTNeuralNetworks classes provided herein.    -   2) For each perfume raw material of interest:        -   a. Using the winMolconn program (version 1.0.1.3), compute            the full complement of available molecular descriptors.        -   b. From the output of winMolconn, extract values of the            following molecular descriptors: nasS, Hmax, fw, xc3,            numHBa, e2C3O1s, e1C3O1d, SssCH2, xv1, SHBa, nasO, e2C2O1,            nasC, SHHBd, nrbond, nelem, SsCH3, eaC2C2a, e1C3O1a,            SHCsatu, Qv, nvx.        -   c. Within a Java main executable program, create an instance            of the ODTNeuralNetworksDescriptors class.        -   d. Using the setter methods of the            ODTNeuralNetworksDescriptors instance, set the values of all            of the descriptors listed in step 2b.        -   e. Within the same Java main executable program, create an            instance of the ODTNeuralNetworks class, using the instance            of the ODTNeuralNetworksDescriptors created in step 2d as a            parameter argument.        -   f. Within the same Java main executable program, retrieve            the computed odor detection threshold value for the given            perfume raw material by calling the getODTModelResult(            )method on the ODTNeuralNetworks instance created in step            2e.

The perfume mixture may have one of the aforementioned OI ranges andhave at least about 5%, by weight of the mixture, of PRMs having an ODTless than or equal to about 1 ppb, or about 10 wt. % of PRMs having anODT less than or equal to about 1 ppb, or from about 10 wt. % to about50 wt. % of PRMs having an ODT less than or equal to about 1 ppb, or atleast about 20 wt. % of PRMs having an ODT less than or equal to about 1ppb, or from about 20 wt. % to about 50 wt. % of PRMs having an ODT lessthan or equal to about 1 ppb, or at least about 30 wt. % of PRMs havingan ODT less than or equal to about 1 ppb, or from about 30 wt. % toabout 50 wt. % of PRMs having an ODT less than or equal to about 1 ppb,or at least about 10 wt. % of PRMs having an ODT from about 0.5 ppb toabout 1 ppb, or from about 10 wt. % to about 50 wt. % of PRMs having anODT from about 0.5 ppb to about 1 ppb.

Exemplary OI values of perfume mixtures suitable for the presentinvention are shown in Table 1.

TABLE 1 Calculated OI of Selected Perfume Mixtures Wt. % of AverageMolar PRMs with VP (ppb Average OI ODT ≦ 1.0 ppb at 25° C.) ODT PerfumeMixture 1 RA 60713 18.60 236842 39.3 Perfume Mixture 2 KR 39813 8.42150000 68.5 Perfume Mixture 3 LF 43993 13.07 117105 32.9 Perfume Mixture4 GS 52270 17.81 128947 23.6 Perfume Mixture 5 SJ 26539 10.85 10657941.7 Perfume Mixture 6 AT 95753 5.57 310000 26.7 Perfume Mixture 7 FL47602 5.77 170000 40.2 Perfume Mixture 8 SM 12891 6.15 150000 36.2Perfume Mixture 9 PP 41375 16.48 97368 25.6

The perfume mixture may comprise about 45 wt. % to about 85 wt. % ofPRMs having a weighted average VP range from about 15,000 ppb to about20,000 ppb; or about 50 wt. % to about 80 wt. % of PRMs having aweighted average VP range from about 15,000 ppb to about 20,000 ppb; orabout 55 wt. % to about 75 wt. % of PRMs having a weighted average VPrange from about 15,000 ppb to about 20,000 ppb. The VP range of anexemplary perfume mixture is shown in Table 2.

TABLE 2 Average Lo Hi VP VP VP Wt. % (ppb @ 25° C.) (ppb @ 25° C.) (ppb@ 25° C.)  6.00-10.00 131579 148684 >148684  8.00-12.00 98684 11513282237 10.00-14.00 65789 82237 49342 15.00-19.00 32895 42763 2302617.00-21.00 13158 14868 11513 15.00-19.00 9868 11513 8224  9.00-13.006579 8224 4934 3.00-7.00 3289 <2303 2303

Any commercially available PRM may be used in a perfume mixture havingthe OI range suitable for the present invention. PRMs materials includethose listed in Table 3.

TABLE 3 VP ODT CAS PRM Mol. % (ppb@ 25° C.) ppb 109-60-4 PROPYL ACETATE0.04 47236842 575 470-82-6 EUCALYPTOL 0.19 2169737 19 68039-49-6 TRIPLAL1.46 760526 0.6 13254-34-7 DIMETOL 0.30 434211 88 6413-10-1 METHYLDIOXOLAN 16.54 288158 56 78-70-6 LINALOOL 2.80 119079 22 140-11-4 BENZYLACETATE 14.34 215789 145 112-31-2 ALDEHYDE C-10 0.18 272368 1 60-12-8PHENYL ETHYL ALCOHOL 5.31 97500 11 67634-00-8 ALLYL AMYL GLYCOLATE 0.0852632 16 5413-60-5 CYCLACET 8.25 18026 12 25265-71-8 DIPROPYLENE GLYCOL0.02 12947 58 627-93-0 DIMETHYL ADIPATE 4.55 95395 21 27538-09-6 ETHYLFRAISON 0.01 15921 24 24851-98-7 HEDIONE 1.27 934 1 101-86-0 HEXYLCINNAMIC ALDEHYDE 1.00 917 0.2 77-93-0 TRIETHYL CITRATE 0.03 230 6132210-23-4 VERTENEX 29.28 135526 2 106-24-1 GERANIOL 0.93 17500 0.4121-32-4 ETHYL VANILLIN 0.13 1163 0.05 18479-58-8 DIHYDRO MYRCENOL 9.22218421 69 91-64-5 COUMARIN 0.20 1711 0.7 104-67-6 UNDECALACTONE/GAMMA1.56 3566 0.4 104-61-0 NONALACTONE/GAMMA 0.92 11289 2 28940-11-6 CALONE1951 0.05 1093 363 97-53-0 EUGENOL 1.32 13684 3 141-13-9 ADOXAL 0.023382 10 Sum 100

The perfume mixture may also contain non-volatile components, such asknown carrier materials including water, solvents, etc. The perfumemixture may have less than 35%, or less than 25%, by weight the perfumemixture, of solvents that are known in the art.

Perfume mixtures of the present invention may be present in acomposition having additional ingredients that are known in the art. Forexample, the perfume mixture may be combined with carriers, aspreviously discussed, and/or with malodor ingredients to neutralizeodors. Suitable malodor perfume mixtures include cyclodextrin, polyaminepolymers, reactive aldehydes and ionones. In such case, the perfumemixture of the present invention may be used in any amount, including50% to 100%, by weight of the composition, of the perfume mixture and30% to 50%, by weight of the composition, of one or more carriers; or0.001% to 10%, by weight of the composition, of the perfume mixture and90% to 99%, by weight of the composition, of the additional ingredients.

Where the perfume mixture of the present invention is used with a fluidtransport member such as a commercially available wick or breathablemembrane, the viscosity of the perfume mixture may be considered as itmay control how and when the PRM is delivered to the fluid transportmember. For example, less viscous PRMs may flow faster than the moreviscous PRMs. The more viscous PRM, being slightly less or of similardensity with the less viscous phase, may remain in a perfume mixturereservoir via gravity. Thus, the less viscous PRM may be delivered tothe transport member and emitted to the atmosphere more quickly. ThePRMs may have viscosities less than about 23 cP and surface tension lessthan about 33 mN/m. In one embodiment, the perfume mixture containing aPRM may have a viscosity of about 1.0 cP to less than about 25 cP,alternatively about 1.0 cP to less than about 23, alternatively about1.0 cP to less than about 15 cP.

The perfume mixture may be designed such that the perfume mixture mayinclude a surface tension of about 19 mN/m to less than about 33 mN/m,alternatively about 19 mN/m to less than about 30 mN/m, alternativelyabout 19 mN/m to less than about 27 mN/m.

Method

The present invention includes a method of diffusing the perfume mixturedescribed herein into a space. The method may comprise the step ofproviding any air freshening device having an evaporation assistanceelement and a delivery engine. The evaporation assistance element may bea fan assembly. The delivery engine has a liquid volatile perfumemixture therein and a fluid transport member, such as a breathablemembrane or wick, in fluid communication with the liquid perfumemixture. The method includes activating via a power source theevaporation assistance element. In some embodiments, where theevaporation assistance element includes chemistry or an agitator, theactivation step may include adding effective amounts of the chemicalevaporation assistance element or manual agitation of the device and/ordelivery engine to assist with evaporating the liquid volatile perfumemixture. The method of the present invention also includes activatingthe evaporation assistance element according to a duty cycle asdisclosed herein.

EXAMPLES Perfume Intensity Test

Perfume mixtures 1 to 9 in Table 1 herein were tested for scentintensity against a Control Mixture, as shown in Table 4.

TABLE 4 Calculated OI of Control Mixture Molar Wt. % Average Averagehaving an VP ODT OI ODT ≦ 1.0 ppb (ppb at 25° C.) (ppb) 18917.62 16.3177000 20.5

Sensory Room Description: large rooms are 15′×15′×8′ tall. The roomshave three glass walls, with a glass door on the front-most wall. Theback wall is an aluminum panel and the ceiling is likewise aluminum. Thefloor is industrial grade tile covering. This room constructioneliminates perfume absorption into surfaces which is common with typicalconstruction (drywall, linoleum tiles, etc.).

Perfume Intensity Evaluation Procedure

-   -   1. The sensory room air controller is set to purge, which        removes air from the room to outside the building. This setting        is maintained for a period of fifteen minutes.    -   2. A trained odor evaluator verifies that there is not any        residual perfume or room odor present in the room. If residual        odor remains in the room, step 1, above, is repeated.    -   3. Once the room is determined to have no residual odor, the        sensory room air controller is then adjusted to two air        exchanges per hour, and no auxiliary fan in the room. At this        point the room is set to ramp to set points for testing. In this        manner, the room temperature and humidity are adjusted to the        desired set points for testing, which are room temperature of        70° F. and Humidity of no greater than 40%.    -   4. After the room has equilibrated to the desired setpoints, an        evaluator enters the room and places the test product at the        desired location within the room and activates (turns the device        on) the device. The evaluator then leaves the room ensuring the        door closes behind them (Doors are set to remain closed at all        times unless physically opened to enter/exit the room). Trained        odor evaluators enter the odor room and close the door.    -   5. The product remains undisturbed in the room for a period of        60 minutes. At the 1 hour timepoint, trained odor evaluators        enter the room and perform perfume odor evaluations over the        next sixty seconds, making observations on intensity, character        and distribution within the room. All doors are closed upon        entering/exiting the room and remain closed during the test        period.

Perfume Intensity Scale:

-   -   81-100=very strong, i.e., extremely overpowering, permeates into        nose, can almost taste it;    -   61-80=strong, i.e., very room filling, but slightly        overpowering;    -   41-60=moderate, i.e., room filling, character clearly        recognizable;    -   21-40=weak, i.e., can be smelled in all corners, still can        recognize character;    -   1-20=very weak, i.e., cannot smell in all parts of the room;    -   0=no odor.

FIG. 1 shows that perfume mixtures according to the present inventionprovide surprising superior scent intensity even at Day 30.

The dimensions and values disclosed herein are not to be understood asbeing strictly limited to the exact numerical values recited. Instead,unless otherwise specified, each such dimension is intended to mean boththe recited value and a functionally equivalent range surrounding thatvalue. For example, a dimension disclosed as “40 mm” is intended to mean“about 40 mm” All percentages and ratios are calculated by weight unlessotherwise indicated.

All documents cited in the Detailed Description are, in relevant part,incorporated herein by reference; the citation of any document is not tobe construed as an admission that it is prior art with respect to thepresent disclosure. To the extent that any meaning or definition of aterm in this written document conflicts with any meaning or definitionof the term in a document incorporated by reference, the meaning ordefinition assigned to the term in this written document shall govern.

While particular embodiments of the present disclosure have beenillustrated and described, it would be obvious to those skilled in theart that various other changes and modifications can be made withoutdeparting from the spirit and scope of the disclosure. It is thereforeintended to cover in the appended claims all such changes andmodifications that are within the scope of this disclosure.

1. A perfume mixture comprising an olfactive index (“OI”) of at least about 12,000, wherein said perfume mixture comprises at least about 5 wt. % of perfume raw materials having an odor detection threshold (“ODT”) less than or equal to about 1 ppb, and said perfume mixtures comprises about 45 wt. % to about 85 wt. % of perfume raw materials having a weighted average VP range from about 15,000 ppb to about 20,000 ppb.
 2. The mixture of claim 1, wherein said OI is at least about 25,000.
 3. The mixture of claim 1, wherein said OI is from about 12,000 to about 100,000.
 4. The mixture of claim 1, wherein at least about 10 wt. % of said perfume mixture comprises perfume raw materials having a ODT less than about 1 ppb.
 5. The mixture of claim 1, wherein at least about 10 wt. % of said perfume mixture comprises perfume raw materials having a ODT from about 0.5 ppb to about 1 ppb.
 6. The mixture of claim 1, wherein about 50 wt. % to about 80 wt. % of said perfume mixture comprises a weighted VP range from about 15000 ppb to about 20000 ppb at 25° C.
 7. The mixture of claim 1, wherein about 55 wt. % to about 75 wt. % of said perfume mixture comprises a weighted VP range from about 15000 ppb to about 20000 ppb at 25° C.
 8. The mixture of claim 1, wherein said perfume mixture comprises less than about 35 wt. % of a solvent.
 9. The mixture of claim 1, wherein the perfume mixture further comprises less than about 20 wt. % of a solvent.
 10. A method of formulating a perfume mixture for use with an energized air freshener comprising the steps of calculating the average OI of said perfume mixture, and selecting perfume raw materials that provide a perfume mixture with an average OI of at least about 12,000.
 11. The method of claim 10, wherein said average OI is at least about 25,000.
 12. The method of claim 10, wherein said average OI is from about 25,000 to about 100,000.
 13. The method of claim 10, further comprising the step of selecting at least about 5 wt. % of perfume raw materials having a ODT less than or equal to about 1 ppb.
 14. The method of claim 10, further comprising the step of selecting perfume raw materials having a VP from about 9000 ppb to about 14000 ppb at 25° C.
 15. A perfume mixture comprising an OI of at least about 12,000, wherein said perfume mixture comprises at least about 5 wt. % of perfume raw materials having a ODT less than or equal to about 1 ppb, and a sensory intensity rating of greater than or equal to
 45. 16. The perfume mixture of claim 15 wherein said perfume mixture comprises less than 35 wt. % of solvent. 17.-27. (canceled) 